Brake drawing system

ABSTRACT

A brake drawing system applied in bikes and any motor vehicle provided with handbrake and pedal driven brake operates by having a pull rod to drive a push rod to engage in linearly reciprocal motion for activating the brake; a brake lever pin on the pull rod constituting transmission between push rod and pull rod; the push rod penetrating an adjustment bushing on the brake lever pin to adjust brake openness by changing relative positions between sleeve and brake lever pin without interfering with the push rod to maintain pull rod openness as adjusted.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention is related to a brake drawing system applied in bikes and any motor vehicle provided with handbrake and pedal driven brake, and more particularly to one that allows easy adjustment and assured maintenance of the openness of the brake pull rod.

(b) Description of the Prior Art

Most of motorcycles or beach mobiles are engine power driven motor vehicles so they could get the greater output of kinetics to operate or by repeatedly stepping on a pair of pedals to drive both wheels for revolving at higher speed in case of a bike. In either case, a high efficiency brake system must be provided to have the wheels turning at high rpm to return to still status in the least time. Disk brake and drum brake at present are the most popular and reliable braking systems. In the disk brake, a disk or a drum is concentrically disposed at and synchronously turning with the wheel hub; and by taking advantage the fact that the liquid is prevented from compression and the Pascal's Law (states that pressure applied to a confined fluid at any point is transmitted undiminished through out the fluid in all directions and acts upon all the parts of the confined vessel at right angles to its interior surfaces and equally upon equal areas), a brake shoe is hydraulically driven to clamp on the disk to produce friction between the brake shoe and the disk or drum to stop the wheel.

In the entire disk brake system, the braking is achieved by having a pair of sliding calipers that push the brake shoe or the drum connected through hydraulic piping a hydraulic cylinder; and the brake pull rod pushes brake oil in the hydraulic cylinder to take advantage of hydraulic power to push the pair of calipers or a piston in the brake drum. The resultant placement by the push from the piston moves a lining for it to contact the brake disk or drum. As illustrated in FIG. 1 of the accompanying drawings for a sectional view of a brake drawing system of the prior art, the drawing system is comprised of a hydraulic cylinder 20 fixed to a support bracket 10 and pivoted with a brake pull rod 30. The brake pull rod 30 is coupled to a push rod 21 of the hydraulic cylinder 20 with a brake lever pin 31. Accordingly, once the pull rod 30 swings as drawn by the user, the swing is transmitted through the brake lever pin 31 to the push rod 21, where a piston 22 coupled to the push rod 21 pushes hydraulic oil inside the hydraulic cylinder 20 to apply the brake.

Whereas the motive power for a handbrake or a pedal driven brake comes from the action of the brake pull rod 30 in a brake drawing system, the openness of the brake pull rod 30 affects the action the brake pull rod 30 permits and the manipulation by the drive or the rider. Consequently, multiple teeth are provided on the push rod 21 and corresponding threaded holes are disposed on the brake lever pin 31 to constitute the coupling between the push rod 21 and the brake lever pin 31. If necessarily, changing the relative positions between the push rod 21 and the brake lever pin 31 by turning the push rod 21 will achieve the purpose of adjusting the openness 30 of the brake pull rod 30.

However, in practice, a wrench is needed to hold and turn the push rod 21 to fail immediate adjustment of the openness of the brake pull rod. It also prevents from maintaining the adjusted openness since the linearly reciprocal motion of the push rod 21 will cause it to revolve on its own axis to change the relative positions between the push rod 21 and the brake lever pin 31, thus to change the openness of the brake push rod 21.

SUMMARY OF THE INVENTION

The primary purpose of the present invention is to provide an improved brake drawing system that is capable of maintaining the openness of the push rod as adjusted. To achieve the purpose, an adjustment bushing is fastened to the brake lever pin for the push rod to penetrate through. Adjusting the openness of the brake pull rod by changing the relative positions between the adjustment bushing and the brake lever pin will maintain the openness of the brake pull rod as adjusted without interfering with the push rod.

In practice, a graded section is provided on the tail of the push rod to allow penetration by the adjustment bushing; a clip is used to clamp at where the push rod leaves the adjustment bushing to constitute the coupling between the push rod and the adjustment bushing; and a nut is disposed externally to the brake lever pin for the user to directly turn the adjustment bushing by fingers as immediate adjustment of the openness of the brake pull rod warrants.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view of a brake drawing system of the prior art.

FIG. 2 is a perspective view of the present invention.

FIG. 3 is an exploded view of the present invention.

FIG. 4 is a sectional view of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A brake drawing system of the present invention as illustrated in FIGS. 2, 3, and 4 is essentially comprised of a support bracket 10 fixed with a hydraulic cylinder 20 and pivoted with a brake pull rod 30. Using the support bracket 10, the entire brake drawing system is mounted to a handle 40 of a motorcycle, beach mobile or bicycle. Wherein, a pin lever 31 is axially disposed on the brake pull rod 30 to constitute transmission between the push rod 21 of the hydraulic cylinder 20 and the pull rod 30, and the transmission is converted through the swing by the brake pull rod 30 into linear motion executed b the push rod 21.

An adjustment bushing 32 is fastened to the pin lever 31 to allow penetration by the push rod 21. Turning the adjustment bushing 32 changes relative positions between the adjustment bushing 32 and the pin lever 31; accordingly, openness of the brake pull or 30 is adjusted without interfering the push rod 21 to revolve on its axis so to ensure of maintaining the openness of the brake pull rod 30 as adjusted.

In practice, a gradation 211 to penetrate through the adjustment bushing 32 is disposed at the tail of the push rod 21, and clamped by means of a locking ring 23 at where the push rod leaves the adjustment bushing 32 to constitute the coupling of the transmission between the push rod 21 and the adjustment bushing 32. A locking ring (not illustrated) is each to the push rod 21 in relation to where externally to both ends of an adjustment bushing 32. Furthermore, an adjustment nut is provided to the adjustment bushing 32 at where externally to the pin lever 31 for the user to directly turn the adjustment bushing 32 for immediate adjustment the openness of the brake pull rod 21.

The prevent invention provides an improved structure of a brake drawing system applied in bikes and automobiles, and the application for a utility patent is duly filed accordingly. However, it is to be noted that the preferred embodiments disclosed in the specification and the accompanying drawings are not limiting the present invention; and that any construction, installation, or characteristics that is same or similar to that of the present invention should fall within the scope of the purposes and claims of the present invention. 

1. A brake drawing system to activate brake installation by having a brake pull rod to drive a push rod to engage in linearly reciprocal motion; a pin lever being axially provided on the brake pull rod to constitute transmission between the push rod and the brake pull rod; an adjustment bushing be fastened to the pin lever to permit insertion by the push rod to adjust openness of the brake pull rod without inferring with revolving at own axis by the push rod by changing relative positions between the adjustment bushing and the pin lever.
 2. The brake drawing system of claim 1, wherein a gradation is provided at the tail of the push rod that penetrates the adjustment bushing, and is clamping by a locking ring to where the push rod leaves the adjustment bushing to constitute coupling of transmission between the push rod and the adjustment bushing.
 3. The brake drawing system of claim 1, wherein s locking ring is each to the push rod in relation to where externally to both ends of an adjustment bushing to constitute coupling between the push rod and the adjustment bushing.
 4. The brake drawing system of claim 1, wherein an adjustment nut is externally disposed to where the adjustment bushing is provide to the brake lever pin. 